Oh well, I see what is going on there. I've had the same problem with `grunt-contrib-compass` in a other project, and it is because the banner option does not use the configuration of compass, but only what is set in the `Gruntfile`. For me this was a reason not to use the banner option.

But if we want to use it, maybe we should move all the compass options to the `Gruntfile` and remove `config.rb`?